title: Cell-stage-specific enhancement by caffeine of the frequency of chromatid aberrations induced by X-rays in neural ganglia of Drosophila melanogaster.
abstract: Caffeine (10(-2) M) induced a high level of chromatid aberrations in neural ganglia of third-instar larvae of Drosophila melanogaster only when it was added to cells in late G2 and mitotic prophase. No aberrations were observed after treatment in late S--middle G2 or C-mitosis. We observed that, in these stages, caffeine strongly increased X-ray-induced damage (500 R). This potentiation was quantitatively similar. But it involved all types of aberration after treatment in C-mitosis, and essentially isochromatid deletions and chromatid exchanges after treatment in S--G2. Some hypotheses are put forth to explain the possible mechanism of action of caffeine in the potentiation of X-ray-induced damage.
mesh_terms: D000818:Animals; D002110:Caffeine / Q000494:pharmacology*; D002453:Cell Cycle; D002842:Chromatids / Q000187:drug effects / Q000528:radiation effects; D002869:Chromosome Aberrations; D004331:Drosophila melanogaster / Q000235:genetics*; D005724:Ganglia / Q000528:radiation effects; D007814:Larva / Q000648:ultrastructure; D014965:X-Rays
chemical_list: D002110:Caffeine